NVV - Overhead lines and overhead electrical conductors

A new overhead line is defined as the new construction of the totality of all conductors, their supports together with foundations, earthing grid, insulators, accessories and fittings used for the overground transport of electrical energy between two points A and B.

This document applies to aeolian vibration dampers intended for single conductors or earth
wires or conductor bundles where dampers are directly attached to each subconductor.
The purchaser may adopt part(s) of this document when specifying requirements for cables
different from those mentioned above (e.g. optical ground wires (OPGW), all dielectric selfsupporting
optical cables (ADSS)).
In some cases, test procedures and test values are left to agreement between the purchaser
and the supplier and are stated in the procurement contract.
Annex A lists the minimum technical details to be agreed between purchaser and supplier.
Throughout this document, the word “conductor” is used when the test applies to dampers for
conductors or earth wires.

This document applies to spacers for conductor bundles of overhead lines. It covers rigid
spacers, flexible spacers and spacer dampers.
It does not apply to interphase spacers, hoop spacers and bonding spacers.
NOTE This document is written to cover the line design practices and spacers most commonly used at the time of
writing. There may be other spacers available for which the specific tests reported in this document may not be
applicable.
In some cases, test procedures and test values are left to agreement between purchaser and
supplier and are stated in the procurement contract. The purchaser is best able to evaluate
the intended service conditions, which should be the basis for establishing the test severity.
In Annex A, the minimum technical details to be agreed between purchaser and supplier are
listed.

1.1    General
1.1   RO.1 General
(ncpt)   This Part 2-24 gives the requirements for planning, design and construction of overhead electrical lines with nominal voltages exceeding A.C. 1 kV operating at 50 Hz frequency.
The present Part 2-24 is not applicable for existing overhead electrical lines unless specifically required by Project Specification. The power installations of overhead lines, that are in different stages of design or construction, can be finalised in conformity with the standards in force at project beginning.
      For the application of this standard for specific requirements relaring to modernization, increasing safety and transport capacity of existing overhead lines, reference shall be specified in the Project Specification. At the same time, the correlation between relevant regulations and associated standards shall be established in the Project Specifications.
The extension of existing electrical lines is considered as new overhead lines, except the junction points that shall be detailed in the Project Specifications.
1.2    Field of application
1.2        RO.1    Overhead electrical lines with insulated conductors
(ncpt)   This Part 2-24 is applicable for the design and construction of overhead electrical lines with insulated conductors where the internal and external clearances can be smaller than those specified in Part 1 (SR EN 50341-1:2013).

1 Scope
1.1 General
BE.1 Scope of Part 1 and Part 2-2
(ncpt) Part 1 and the present Part 2-2 are only applicable to completely new or completely replaced overhead lines between two points, A and B, as well as to new supports on new foundations with nominal voltages above AC 50 kV.
(A-dev) Overhead lines or supports with nominal voltages exceeding AC 1 kV up to and including AC 50 kV are treated as a high voltage of the first category in the General Regulations of the Electrical Installations (GREI) and follow completely the GREI for their dimensioning.
1.2 Field of application
(ncpt) BE.1 Application to telecommunication equipment
Part 1 and this NNA apply to telecommunication equipment mounted on the new supports (e.g. dishes, antennas), particularly with respect to wind assumptions.

EN 50341-2-15 is applicable for new high-voltage overhead lines only, not for existing lines in the Netherlands. This NNA includes the requirements for application of plastic cables, with metal or without (ADSS) metal, for telecommunication, as well as for conductor/earthwire (groundwire) systems (e.g. wraparound,....). This NNA is applicable for fixing of structural elements for telecommunication (e.g. dishes), if mounted on power line supports (towers), especially regarding the wind forces and ice loads on such fixed elements. To overhead electrical lines exceeding 1 kV (A.C.) but lower than 45 kV (A.C.) Part 1 is applicable without special national conditions (snc) or national complements (ncpt).

EN 50341-2-4 applies for planning and design of overhead lines with nominal voltages above AC 1 kV. This EN needs not to be adopted for existing installations. Installations in the planning and construction stage may be completed adopting the standard edition valid at the beginning of planning.In Germany this EN is applicable for all types of conductors (according to the information in clause 1.2) which contain components for telecommunication. In Germany this EN is applicable for the installation of telecommunication equipment on supports. Reference is made to 4.11.1/DE.1 “Extension of utilization”.

This NNA is only applicable to all new overhead lines above A.C. 1kV.
This Euronorm is only applicable to new overhead lines and shall not be applied to maintenance, reconductoring, tee-offs, extensions or diversions to existing overhead lines unless specifically required by the Project Specification.
For details of the application of this standard for overhead lines constructed with covered conductor refer to the Project Specification.
For details of the application of this standard to telecommunication systems involving optical fibres either incorporated in or wrapped around earthwires or conductors or suspended from overhead line supports, reference should be made to the Project Specification.

GB.1   General
This NNA is only applicable to all new overhead lines above A.C. 1kV.
This Euronorm is only applicable to new overhead lines and shall not be applied to maintenance, reconductoring, tee-offs, extensions or diversions to existing overhead lines unless specifically required by the Project Specification.
For details of the application of this standard for overhead lines constructed with covered conductor refer to the Project Specification.
For details of the application of this standard to telecommunication systems involving optical fibres either incorporated in or wrapped around earthwires or conductors or suspended from overhead line supports, reference should be made to the Project Specification.

Part 1 and the present Part 2-8 apply to new overhead lines as defined in 1.1/FR.2 "Definition of a new overhead line". A new overhead line denotes any new overhead electrical line exceeding AC 1 kV built on new foundations and: - flanked by two substations or two terminal towers preceding said substations. or - flanked by a substation or a terminal tower at one end and in a branch situation (including branch tower) or tapping situation at the other end. This standard does not apply to existing overhead lines exceeding AC 1 kV in France. Any decision to apply the requirements of the present standard to new overhead line projects for which technical studies are underway shall be stipulated in the Project Specification. The requirements of the present standard do not apply to overhead lines under construction. Part 1 and Part 2-8 apply to radio telecommunication equipment mounted on the towers of new overhead lines, particularly with respect to wind and ice assumptions. Radio equipment shall be arranged on the support so that it can be accessed and operations performed in accordance with safety regulations.

1.1 General
1.1 IS.1 Application to new lines
(snc) This Part 2-12 is only applicable to new overhead transmission lines exceeding 1 kV (AC). If deviations and/or extensions to existing transmission lines are planned, the Icelandic NC shall be informed and will decide case by case whether ÍST EN 50341 is applicable or not.

General
(snc)   EE.1   Application to new lines
In Estonia the standard EN 50341-1 (Part 1) can only be applied using this NNA (EN 50341-2-20) containing National Normative Aspects for Estonia.
This Part 2-20 applies to all new overhead electric lines with nominal system voltages exceeding AC 1 kV and also for low voltage (below 1 kV AC) overhead lines performed by aerial cables. The requirements of the structural design are applicable also for DC overhead lines, where the electrical requirements are given in the Project Specification.
(ncpt)   EE.2   “New overhead line”
A “new overhead line” means a completely new line between two points, A and B. A new branch line of the existing power line should be considered as a new power line including the junction support. Specific requirements for junction support should be defined with the Project Specification.
1.2   Field of application
(ncpt)   EE.1   Application to covered conductors and aerial cables
The standard includes requirements for the design and construction of overhead lines with nominal system voltages up to 45 kV AC equipped with covered conductors and aerial cables. Additionally, the requirements of the equipment standards and manufacturers’ instructions shall be followed.
(A-dev)   EE.2   Application to mounting of telecommunication equipment
The Standard EVS-EN 50341:2013 is applicable to fixing of structural elements for tele-communication (antennas, All Dielectric Self Supporting (ADSS) equipment, junction boxes, etc.), if mounted on power line supports (towers), especially regarding wind forces and ice loads on such fixed elements. The design and installation should be done under the due control of the line owner and/or the competent authority. Mounting of telecommunication equipment on power line supports must be coordinated with the line owner and stated in the Project Specification.
This standard applies to telecommunication lines only in the case of their common installation with power lines. This standard does not apply to separately installed telecommunication overhead lines.
If telecommunication equipment (antennas, dishes, etc.) will be installed in the transmission line supports, and their size, location or mounting may have major effects on the loads or design of the structures, the requirements of EVS-EN 1993-3-1/NA:2009 shall also to be taken into account. If such structures include conductive parts, the requirements on clearances in subclause 5.8 should be applied.
(ncpt)   EE.3   Application to installation of other equipment
Only equipment belonging to the line (electric or telecommunication line) can be installed on the overhead lines. However, with the permission of the owner of the line, equipment serving communal services or environmental protection like road signs, warning signs or warning balls, etc., may also be installed. The installation height of equipment meant to be installed and maintained by an instructed person shall be such that the work can be done without climbing the support and the distances of safe electrical work can be followed. The additional loads due to this equipment on the line supports shall be taken into account if necessary.

20170619: No XML for NNA standards

General
(ncpt) SK.1 New overhead line
As a new overhead line is considered a brand new electric overhead line with nominal
voltage exceeding 1 kV AC, between the points A and B.
The new branch line of the existing overhead line shall be considered as a new overhead
line except for a junction support for which the specific requirements shall be defined in the
Project Specification.
The extent of application of this standard in respect of reconstruction, relaying and extension
of existing overhead lines shall be determined in the Project Specification. Simultaneously,
the Project Specification shall determine, which of the previous national standards shall be
used and to what extent they shall be used for the project in question.
1.2 Field of application
(ncpt) SK.1 Field of application
The requirements of this standard shall be adopted, where applicable (e.g. requirements on
loads, external clearances, etc.), for telecommunication cables as well.
In case of overhead line under the design stage, parties concerned shall agree the extent of
the application of this standard.
Overhead line under construction may be completed according to standards valid during the
design stage of the line. The parties concerned shall agree any possible application of
certain clauses of this standard.
(ncpt) SK.2 Installation of telecommunication equipment on supports
Provisions of this standard also apply to the telecommunication equipment and devices
(aerials, dish antennas, etc.) which are installed on individual supports of overhead power
lines, especially in terms of wind and ice loads on such installed equipment. Design and
installation has to respect requirements of the utility operating the line in question. The
design of such telecommunication equipment has to incorporate such technical solutions and
such precautions, which shall allow safe access and maintenance of both a power line and
telecommunication equipment, and which shall provide protection of persons performing
repairs or maintenance of the power line and/or telecommunication equipment against
electric shock and protection of telecommunication equipment and attached installations
against the influence of the power line (short-circuits, switching and lightning overvoltages
etc.).

This Part 2-16 is applicable for new permanent overhead lines only and generally not for existing lines in Norway. If some planning/design or execution work on existing lines in Norway has to be performed, the degree of application of this Standard shall be agreed upon by the parties concerned and the authorities.

This Part 2-5 is applicable for new permanent overhead lines only and generally not for existing lines in Denmark. If some planning/design or execution work on existing lines in Denmark has to be performed, the degree of application of this Standard shall be agreed upon by the parties concerned and the authorities.
Installations in the planning and construction stage may be completed adopting the standard edition valid at the beginning of planning.

This NNA is applicable to any new line between two points, A and B, its modifications and extensions.
The design and construction of overhead lines with covered conductors and voltages greater than 45 kV shall respect the same electrical clearances as of overhead lines with bare conductors of the same voltage.

SE.1 Application to existing overhead lines
This Part 2-18 is applicable for new overhead lines only and not for existing lines.
(A-dev)
SE.2 Maintenance, rebuilding or extension of an overhead line
Measures related to maintenance of the electrical installation shall fulfill the legislation in force when it
was erected. In the case of a rebuilding or extension of an electrical installation (overhead line), the
regulations in force shall be applied for the rebuilding or extension. (ELSÄK-FS 2008:1)
(ncpt)
SE.3 Replacement
This Part 2-18 replaces the Swedish Standards SS-EN 50341-3-18, edition 1 and SS-EN 50423-3-18,
edition 3.
(ncpt)
SE.4 Optical ground wire (OPGW) and optical phase conductor (OPCON)
This Part 2-18 is applicable for installation of OPGW and OPCON, also known as OPPC, in overhead
lines in Sweden.
(ncpt)
SE.5 All dielectric self supporting optical cable (ADSS) and optical attached cable (OPAC)
This Part 2-18 is applicable for installation of ADSS and OPAC in overhead lines in Sweden.
NOTE The allowable electrical field for the ADSS cable should be taken into consideration when the conductor
configuration is determined.

This NNA (National Normative Annex) is only applicable to all new overhead lines equipped with bare conductors, covered conductors or cables, with voltages above 1kV AC. This standard is not applicable to overhead lines pre-existing before its coming into force and shall not be applied to maintenance or reconductoring; the standard can be applied in case of significant modifications of existing lines.

PL.1 Scope of application
This NNA determines the requirements which shall be fulfilled while designing and constructing of
new overhead lines with nominal system voltages exceeding 1 kV AC. The scope of use of this NNA
for temporary lines shall be determined by the Project Specification. For modernisations,
reconstructions and refurbishments of the existing lines, the scope and the requirement to comply
with PN-EN-50341-1, together with this NNA, shall be determined by the Project Specification.
1.2 Field of application
(ncpt) PL.1 Overhead lines with covered conductors
This NNA applies to overhead lines with covered conductors and overhead insulated cable system
with nominal voltage exceeding 1 kV up to 45 kV AC. Additional requirements and simplifications,
which apply only to this range of voltages, have been determined.
This NNA does not contain requirements applicable for designing and constructing overhead lines
with nominal voltage exceeding 45 kV AC, with covered conductors, where internal and external
clearances can be smaller than specified in the NNA.
(ncpt) PL.2 Optical conductors/wires
This NNA also applies to optical phase conductors (OPCON) and optical ground wires (OPGW),
containing optical fibre telecommunication circuits, installed on overhead line supports.
(ncpt) PL.3 All Dielectric Self Supporting (ADSS) cables
This NNA applies to all – dielectric cables (ADSS) only within the scope of their influence on the load
of the support and the requirements of the insulator clearances.
(ncpt) PL.4 Installation of telecommunication fittings
The NNA also applies to the installation of telecommunication equipment mounted on the new line
structures with their primary function as of overhead line supports.

This EN applies for planning and design of overhead lines with nominal voltages above
AC 1 kV.
This EN needs not to be adopted for existing installations. Installations in the planning and
construction stage may be completed adopting the standard edition valid at the beginning of
planning.

1.1   General
(ncpt)   CZ.1   New overhead line
The new overhead line is considered a brand new electric overhead line with nominal voltage exceeding 1 kV AC, between the points A and B.
The new branch line of the existing overhead line shall be considered a new overhead line except for a junction support for which the specific requirements shall be defined in the Project Specification.
The extent of application of this standard in respect of reconstruction, relaying and extension of existing overhead lines shall be determined in the Project Specification. Simultaneously, the Project Specification shall determine, which of the previous national standards shall be used and to what extent they shall be used for the project in question.
1.2   Field of application
(ncpt)   CZ.1   Field of application   
The requirements of this standard shall be adopted, where applicable (e.g. requirements on loads, external clearances, etc.), for telecommunication cables as well.
In case of overhead line under the design stage, parties concerned shall agree the extent of the application of this standard.
Overhead line under construction may be completed according to standards valid during the design stage of the line. The parties concerned shall agree any possible application of certain clauses of this standard.
(ncpt)   CZ.2   Installation of telecommunication equipment on supports   
Provisions of this standard also apply to the telecommunication equipment and devices (aerials, dish antennas, etc.) which are installed on individual supports of overhead power lines, especially in terms of wind and ice loads on such installed equipment. Design and installation has to respect requirements of the utility operating the line in question. The design of such telecommunication equipment has to incorporate such technical solutions and such precautions, which shall allow safe access and maintenance of both a power line and telecommunication equipment, and which shall provide protection of persons performing repairs or maintenance of the power line and/or telecommunication equipment against electric shock and protection of telecommunication equipment and attached installations against the influence of the power line (short-circuits, switching and lightning overvoltages etc.).

1.1 General
(ncpt)   FI.1   Application of the standard in Finland
In Finland the standard EN 50341-1 (Part 1) can only be applied using this NNA (EN 50341-2-7) containing National Normative Aspects for Finland.
The requirements of the standard are applied also for low voltage (below 1 kV AC) overhead lines. The requirements of the structural design are applicable also for DC overhead lines, where the electrical requirements are given in the Project Specification.
This standard is applicable for new overhead lines only.
(ncpt)  FI.2   Application for existing overhead lines
Overhead lines complying with the mechanical and electrical requirements of its original date of construction can be operated and maintained, if they do not cause obvious danger.
The reparation and overhaul of lines can be done according to the previous requirements. Reparation means that a component which has been damaged is substituted with a similar new one. Overhaul means a wider improvement of the line for extending its lifetime. The basic structure remains same as before.
This standard should be used for all modification works on existing lines. In modification works earlier norms and standards may also be used. In that case it shall especially be verified that changes in actions do not have significant impact on the loads of lines. Modification work means e.g. relocation of some supports or an extension to a line when this supplement has been taken into account in the original design, e.g. addition of a circuit or changing of the conductors to existing supports.
1.2      Field of application
(ncpt)   FI.1   Application to covered conductors and aerial cables
The standard includes requirements for the design and construction of overhead lines equipped with covered conductors and aerial cables. Additionally, the requirements of the equipment standards and manufacturers’ instructions shall be followed.
(ncpt)   FI.2   Application to cables for telecommunication
   The standard includes requirements for the application of telecommunication cables installed on common supports with electrical lines.
(ncpt)   FI.3   Installation of other equipment
Only equipment belonging to the line (electric or telecommunication line) can be installed on the overhead lines. However, equipment serving communal services or environmental protection like telecommunication equipment, road signs, warning signs or warning balls may also be installed with the permission of the owner of the line.
Other equipment than those mentioned above can also be installed on supports equipped with aerial cables with the permission of the owner of the line.  
If other equipment is installed on the supports, the requirements of safe working practices shall be taken into account. The installation height of equipment meant to be installed and maintained by an ordinary person shall be such that the work can be done without climbing the support and the distances of safe electrical work can be followed (see standard SFS 6002).
The additional loads due to other equipment on the line supports shall be taken into account.

It is only applicable to all new overhead lines above A.C. 1kV. This Euronorm is only applicable to new overhead lines and shall not be applied to maintenance, reconductoring, tee-offs, extensions or diversions to existing overhead lines unless specifically required by the Project Specification. For details of the application of this standard for overhead lines constructed with covered conductor refer to the Project Specification. For details of the application of this standard to telecommunication systems involving optical fibres either incorporated in or wrapped around earthwires or conductors or suspended from overhead line supports, reference should be made to the Project Specification.

The scope of this Standard is to provide test procedures based on the above-mentioned documents and devoted to minimize the causes of discrepancy between test results, taking into consideration the large experience accumulated in the last 30 years by numerous test engineers and available in literature, including a CIGRE Technical Brochure specifically referring to this standard (see Bibliography). This Standard describes the current methodologies, including apparatus, procedures and accuracies, for the measurement of conductor self-damping and for the data reduction formats. In addition, some basic guidance is also provided to inform the potential user of a given method's strengths and weaknesses. The methodologies and procedures incorporated in this Standard are applicable only to testing on indoor laboratory spans.

This standard specifies the electrical and mechanical characteristics of round wire concentric lay bare overhead electrical conductors stranded in alternate directions, with or without grease as per prEN 50326, made of one or a combination of any of the following: a) Hard drawn Aluminium as per HD 532 S1 designated AL1 b) Aluminium alloy as per prEN 50183 designated AL2 to AL7 c) ST1A, ST2B, ST3D, ST4A, ST5E, and ST6C designating the grade and class of zinc coated steel wire as per prEN 50189. d) 20SA (grades A and B), 27SA, 30SA and 40SA designating the class of aluminium-clad steel wire as per EN 61232. Conductors made of zinc coated steel wires only are not included.

Specifies the general requirements that shall be met for the design and construction of new overhead lines to ensure that the line is suitable for its purpose with regard to safety of persons, maintenance, operation and environmental considerations.

This European Standard specifies the electrical and mechanical characteristics of ACSS conductors made of round or formed annealed aluminium wires and steel wires stranded in alternate directions, made of one or a combination of any of the following.

Applicable to testing of towers and structures of overhead lines for voltages above 45 kV. Codifies methods of tests.

This standard specifies the electrical and mechanical characteristics of round wire concentric lay bare overhead electrical conductors stranded in alternate directions, with or without grease as per prEN 50326, made of one or a combination of any of the following: a) Hard drawn Aluminium as per HD 532 S1 designated AL1 b) Aluminium alloy as per prEN 50183 designated AL2 to AL7 c) ST1A, ST2B, ST3D, ST4A, ST5E, and ST6C designating the grade and class of zinc coated steel wire as per prEN 50189. d) 20SA (grades A and B), 27SA, 30SA and 40SA designating the class of aluminium-clad steel wire as per EN 61232. Conductors made of zinc coated steel wires only are not included.

D113/067: TC 7 disbanded

EN following parallel vote

EN following parallel vote

This Technical Report (type 2) aims at providing advice on methods for developing climatic load databases. This is necessary for the implementation of IEC 60826 which provides the framework for National Standards on overhead line design.

EN following parallel vote

EN following parallel vote

2019-10-31:This prAA represents common mods. to prEN IEC 63248 (PR=70075)

2020-10-19: This prAA represents common mods to prEN IEC 62641 (PR=72849)

2019-10-31: Common mods. are included in prAA (PR=70813)

2020-10-19: Common mods to this prEN IEC 62641 are included in prAA (PR=72850)

Slovenian standard is based on SIST EN 50341-1 and apply in Slovenia for the design and implementation of new overhead lines of nominal voltages above 45 kV and reconstruction of the existing ones. This standard should not apply to existing overhead lines. Objects that are in the time of the adoption of this standard designed or built, can be completed in accordance with the regulations in force at the time of obtaining a building permit. In Slovenia, this standard applies to all cables (according to Note 3 in the first paragraph of EN 50341-1), which include telecommunications components. These standards are applicable in Slovenia for the installation of telecommunications equipment to support.

It applies to all new overhead electric lines with nominal system voltages exceeding AC 1 kV and with rated frequencies below 100 Hz. This standard also applies to D.C. overhead lines in structural aspects. A “new overhead line” means a completely new line between two points, A and B. A new branch line of the existing power line should be considered as a new power line including the junction support, for which specific requirements should be defined in the Project Specification.

Corrigendum to EN issued April 2005

EN 50423-2:2005 superseded by EN 50341-1:2012 (PR=22540) and each of the EN 50341-2-X series (NNAs)

Corrigenda to EN issued April 2006 and October 2006